I tried both, moving everything 1 -2 hours later, or just drinking all Eposom salt at 8pm, instead of having 2 separate doses.
Tried also drinking one at 8pm, one at 9pm and olive oil at 10 pm.
Tried also olive oil at 11 pm.
It works OK any way you do it.
I have done 100s of flushes, I don't care anymore so much for the time.
It is even easier for me to just drink one large dose of Eposom in the evening, and one large dose of Eposom in the morning, instead of drinking 2 separate doses evening and morning.
It works for me.
But, larger dose at once is more likely to make you feel nauseous. Walking helps with burping and with getting it to feel good inside.